constraint groking code
diff --git a/libasn1fix/asn1fix_constraint.h b/libasn1fix/asn1fix_constraint.h
new file mode 100644
index 0000000..a04e6a5
--- /dev/null
+++ b/libasn1fix/asn1fix_constraint.h
@@ -0,0 +1,17 @@
+#ifndef _ASN1FIX_CONSTRAINT_H_
+#define _ASN1FIX_CONSTRAINT_H_
+
+/*
+ * Resolve referenced values inside constraints.
+ */
+int asn1constraint_resolve(arg_t *arg, asn1p_constraint_t *ct);
+
+/*
+ * Collect all subtype constraints from all parents of this type and
+ * the type itself, forming a full constraint structure.
+ * Honors the constraints extensibility rules (46.8)
+ * and does other useful transformations.
+ */
+int asn1constraint_pullup(arg_t *arg);
+
+#endif /* _ASN1FIX_CONSTRAINT_H_ */